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= 4
faktor dari 6 dan 15 kan 2 jadi 2 faktorial atau 2! jadi 2.2 atau 2 x 2 = 4
B = {1,3,5,15}
n(A) = 4
n(B) = 4
n(A) = n(B)
n(f : A → (1-1) B) = 4!
= 4 x 3 x 2 x 1
= 24
smgmbntu ya kalau boleh jadikan terbaik ya ^_^